American Civil War
1861–1865 conflict in the United States
The American Civil War was a civil war in the United States between the Union and the Confederacy. The central cause of the war was the status of slavery, especially the expansion of slavery into territories acquired as a result of the Louisiana Purchase and the Mexican–American War. On the eve of the Civil War in 1860, four million of the 32 million Americans (~13%) were enslaved black people, almost all in the South.